
Association Between Vitamin A and D Status and the Risk of COVID-19 in the Elderly Population: A Single-Center ...
Tiewei Li,1,2,* Xudong Cui,2,* Xiaojuan Li,1 Jingping Yang,2 Hongyan Wang,2 Junmei Yang,1 Zhipeng Jin1 1Department of Clinical Laboratory, Children’s Hospital Affiliated to Zhengzhou University, Zhengzhou Key Laboratory of Children’s …